NoteBy pressing the button D during the control this is cancelled and the CCS is
activated.
Adaptive Cruise Control (ACC)
Introduction
This chapter contains information on the following subjects:
Operation
110
Automatic stop-start
111
Operation overview
111
Start control
112
Stop/resume control
112
Set/change the desired speed
112
Set the clearance level
113
Special driving conditions
113
Overtaking and towing
114
Malfunctions
114
The Adaptive Cruise Control (hereinafter referred to as ACC) maintains the set
speed or the distance to the vehicle ahead without the accelerator or brake
pedal being pressed.
The front of the vehicle and the distance to the vehicle ahead is monitored by
a radar sensor » page 100.
The state in which the ACC maintains the speed or the proximity is described
as control from here on.
WARNING■
The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
The driver must always be ready to take over the operation of the accel-
erator and brake pedal.
■
The ACC does not react when approaching a stationary obstacle, such as
traffic jams, vehicle breakdowns or vehicles waiting at a traffic light.
■
The ACC does not respond to crossing or oncoming objects.
■
If the ACC does not decelerate fast enough, immediately apply the vehi-
cle's foot brake.
WARNINGFor safety reasons, do not use the ACC under the following conditions.■When driving in turning lanes, motorway exits or construction sites, to
avoid an unwanted acceleration to the stored speed.■
When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
■
When road conditions are poor (e.g. ice, slippery road, gravel, dirt road).
■
Driving into “sharp” corners or in steep gradients / on steep inclines.
■
When driving through places where metal objects (such as metal build-
ings, railway tracks, etc.) can be found.
■
When driving through very divided and enclosed spaces (such as large-ca-
pacity garages, car ferries, tunnels and the like.).
Note
■ The ACC is designed primarily for use on motorways.■The ACC reduces the speed by automatically releasing the accelerator or by
means of a braking procedure as appropriate. If the brakes are used for an au-
tomatic speed reduction at any moments, then the brake light illuminates.■
In case of failure of more than one brake light on the vehicle or on the con-
nected trailer, the ACC becomes unavailable.
■
The control automatically cancels the engagement of the brake supportive
assistance systems (e.g. ESC) or when the maximum permitted engine speed is
exceeded.
Operation
Fig. 140
Display of the instrument cluster: Examples of ACC displays
110Driving
Fig. 141
Display of the instrument cluster: Examples of ACC status dis-
plays
Read and observe
on page 110 first.
The ACC allows a speed of 30-160 km/h to be set or a distance to the preced-
ing vehicle to be very short of very long to be set.
The ACC adjusts the set speed with respect to the detected vehicle ahead,
thus maintaining the selected proximity.
The ACC can detect a vehicle that is up to approx. 120 m ahead using the radar
sensor.
ACC display » Fig. 140
Vehicle detected (control active)
Line showing the displacement of the distance when setting » page 113,
Set the clearance level
Set distance to the vehicle ahead
Vehicle detected (control deactivated)
ACC status displays » Fig. 141
Control deactivated.
Control activated - no vehicle detected.
Regulation deactivated - no speed stored.
Control activated (vehicle detected).
Note to reduce speed
If the delay of the ACC is insufficient in relation to the vehicle in front, the
warning light lights up in the instrument cluster and the display shows a
message to engage the brake pedal.
1234NoteSome ACC notifications in the display of the instrument cluster may be hidden
by notifications for other functions. An ACC notification automatically appears
for a brief moment when there is a change in status of the ACC.
Automatic stop-start
Read and observe
on page 110 first.
Vehicles with an automatic transmission can decelerate to a complete stop
and start moving again using the ACC.
Decelerate to a complete stop
If a vehicle ahead decelerates to a standstill, the ACC will also decelerate your
vehicle to a complete stop.
Starting to drive again after a holding period
As soon as the vehicle ahead starts moving again after a holding period, your
vehicle will also move and the speed will continue to be controlled. Control is
automatically disconnected in case of longer holding periods.
Operation overview
Fig. 142
Operating lever
Read and observe
on page 110 first.
Overview of ACC functions operated with the lever » Fig. 1421Activate ACC (control deactivated)2Start control (resume) / increase speed by 1 km/h at a time
(sprung position)3Interrupt control (sprung position) 111Assist systems
Set the clearance levelRead and observe
on page 110 first.
The proximity to the vehicle ahead can be set with the lever » Fig. 142 on
page 111 or in the Infotainment » Owner's Manual Infotainment .
Setting by means of the lever
›
Set the switch
Adjust in the spring-tensioned position
or
» Fig. 142
on page 111 .
The display of the instrument cluster shows line
2
» Fig. 140 on page 110 ,
which indicates the proximity.
›
Using the switch on the lever, adjust the line
2
to the desired dis-
tance.
Note
■ If the proximity is changed in infotainment, the change will only come into
effect after a subsequent activation of the ACC.■
The higher the speed, the greater the proximity to the vehicle ahead.
Special driving conditions
Fig. 143
Cornering / narrow vehicles or vehicles travelling side by side
Fig. 144
Lane changes of other vehicles / stationary vehicles
Read and observe
on page 110 first.
The following (and similar) situations require special attention and possibly the intervention of the driver (braking, accelerating etc.).
When cornering
When driving into or driving out of long corners, it could be that a vehicle is
travelling in the adjacent lane and is scanned by the radar » Fig. 143 -
. The
host vehicle is then controlled according to this vehicle.
Narrow vehicles or vehicles travelling side by side
A narrow or offset vehicle driving can only be recognized by the ACC if this is
located in the scanning range of the radar » Fig. 143 -
.
Other vehicles changing lanes
Vehicles that change onto the lane with a small distance » Fig. 144 -
may not
be detected by ACC in good time.
Stationary vehicles
The ACC does not detect stationary objects! When a vehicle detected by the
ACC turns or sheers off and there is a stationary vehicle in front of this vehi-
cle, » Fig. 144 -
the ACC does not respond to the stationary vehicle.
Vehicles with special load or special body parts
Other vehicles with a load or with body parts protruding from the sides, back
or top of the vehicle contour may not be detected by the ACC.
113Assist systems
Overtaking and towingRead and observe
on page 110 first.
When overtaking
When your vehicle is being controlled at a speed that is lower than the set
speed and the turn signal is operated, ACC assesses this situation as meaning
that the driver wishes to overtake. The ACC automatically accelerates the vehi-
cle, thereby reducing the proximity to a vehicle ahead.
If your vehicle changes to the overtaking lane and no vehicle is detected
ahead, ACC accelerates until the set speed is reached and then keeps it con-
stant.
Acceleration can be cancelled at any time by touch on the brake pedal or
pressing the button on the lever
» Fig. 142 on page 111 .
Towing a trailer
When towing, or if another accessory is connected to the trailer socket, ACC control is set with a lower rate. The manner of driving should therefore be
adapted to this limitation.
Malfunctions
Read and observe
on page 110 first.
If, for some unknown reason, ACC is not available, the warning light appears
in the display of the instrument cluster and an appropriate message is shown.
Sensor covered / dirty
If the sensor is dirty or covered, a message indicating that there is no sensor
view appears. Clean the sensor cover or remove the obstacles » Fig. 125 on
page 100 .
ACC not available
If the ACC is currently unavailable, a message concerning the unavailability ap-
pears. Stop the vehicle, switch off the engine and then start it again. If ACC
continues to be unavailable, seek the assistance of a specialist garage.
ACC fault
With an ACC fault, an error message appears. Seek help from a specialist ga-
rage.
Front Assist
Introduction
This chapter contains information on the following subjects:
Operation
114
Distance warning
115
Warning and automatic braking
115
Deactivation/activation
116
Malfunctions
116
The Front Assist (hereinafter referred to as "system") warns you of the danger
of a collision with a vehicle or another obstacle in front of the vehicle, and tries
to avoid a collision or mitigate its consequences by automatically applying the
brakes where necessary.
The area in front of the vehicle is monitored by a radar sensor » page 100.
WARNING■
The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
The system does not respond to crossing or oncoming objects.
CAUTION
In case of failure of more than one brake light on the vehicle or on the electri-
cally connected trailer, the system becomes unavailable.
Operation
Read and observe
and on page 114 first.
The system support is provided in the following manner.▶ Alerts you about a dangerous proximity to the vehicle ahead.
▶ Warns you of an impending collision.
▶ Assists with a brake action triggered by the driver.
▶ If the driver fails to respond to a detected danger, an automatic braking ac-
tion is performed.
The system can work only if the following basic conditions are met. The system is activated.
TCS is activated » page 102.
The vehicle is travelling forwards at a speed of more than approx. 5 km/h.
114Driving
NoteThe system can be impaired or may not be available, for example when driving
in “sharp ”curves or with an ESC engagement » page 101.
Distance warning
Fig. 145
Instrument cluster display: Distance warning
Read and observe and on page 114 first.
The display of the distance warning is for vehicles with MAXI DOT display.
If a safe distance from the vehicle ahead is fallen short of, the warning
light
» Fig. 145 appears in the display.
Immediately increase the proximity if the current traffic situation allows you
to do so!
The proximity at which the warning is displayed depends on the current speed.
The warning may occur when driving between about 60 km/h and 210 km/h.
Warning and automatic braking
Fig. 146
Instrument cluster display: Warning or emergency
braking at low speed
Read and observe and on page 114 first.
Emergency braking at low speed
If there is a risk of collision in a vehicle speed range of about 5 km/h to 30 km/h, the system triggers an automatic braking.
With automatic braking, the warning light
» Fig. 146 appears in the display.
Advance warning
If the system detects a risk of collision, the warning light
» Fig. 146 appears in
the display and you will hear an acoustic signal.
The pre-warning display can occur in the following situations.
▶ If there is a risk of collision with a moving obstacle at a driving speed range
of approx. 30 km/h to approx. 210 km/h.
▶ If there is a risk of collision with a stationary obstacle at a driving speed
range of approx. 30 km/h to approx. 85 km/h.
With a warning the brake pedal must be pressed or the moving obstacle is to
be avoided!
Acute alert
If the driver does not react to the advance warning when in danger of a colli-
sion with a moving obstacle, the system briefly applies the brake automatically
via an active brake intervention to draw attention to the potential danger of a
collision again.
Automatic Braking
If the driver does not respond to acute warning, the system begins to auto-
matically brake the vehicle.
If an automatic brake intervention is triggered by the system, the pressure in
the brake system increases and the brake pedal cannot be operated with the
normal pedal stroke.
The automatic braking interventions can be cancelled by pressing the acceler-
ator pedal or by steering intervention.
Brake assist
If the driver brakes inadequate with an impending collision, the system auto-
matically increases braking force.
The braking assistance only occurs as long as the brake pedal is being firmly
pressed down.
115Assist systems
Deactivation/activationFig. 147
Buttons / Dial: on the operating lever / the multifunction steer-
ing wheel
Read and observe
and on page 114 first.
The function is automatically activated each time the ignition is switched on.
The system should only be disabled in exceptional cases »
.
On vehicles with the MAXI DOT display, the system can be activated/deactiva- ted in the main menu » page 41, Menu item
assist systems
.
Deactivation / activation in vehicles with segment display
Button
» Fig. 14 7ActionOperation
AHold up / downShow Front Assist menu itemBPressDeactivate/activate system
Deactivation / activation in vehicles with multi-function steering wheel
Button /dial
» Fig. 14 7
ActionOperation
CPressShow Front Assist menu itemDPressDeactivate/activate system
Disable / enable and setting in the Infotainment
In Infotainment, the entire system or the functions warning and distance
warning can be deactivated/activated » Owner's Manual Infotainment .
If the distance-warning function was deactivated before switching off the igni-
tion, it remains deactivated after switching on the ignition.WARNINGIn the following situations, Front Assist should be switched off for safety
reasons.■
When the vehicle is being towed away.
■
When the vehicle is on a rolling test bench.
■
If an unfounded warning or a system action was taken.
■
When on a truck, or a car ferry service or similar.
Malfunctions
Read and observe
and on page 114 first.
If, for some unknown reason, the system is not available, an appropriate mes-
sage appears in the display of the instrument cluster.
Sensor covered / dirty
If the sensor is dirty or covered, a message indicating that there is no sensor
view appears. Clean the sensor cover or remove the obstacles » Fig. 125 on
page 100 .
System unavailable
If the system is currently unavailable, a message concerning the unavailability
appears. Stop the vehicle, switch off the engine and then start it again. If the
system still is not available, seek the assistance of a specialist garage.
Fatigue detection
The fatigue detection system (hereinafter referred to as "system") recom-
mends the driver takes a break from driving when driver fatigue can be detec-
ted due to the driver's steering behaviour.
From the starting of the journey, the system evaluates the steering behaviour
at speeds 65-200 km/h. If, while driving, there have been changes in the steer-
ing behaviours that are evaluated by the system as indicating possible fatigue,
a break recommendation is issued.
Conditions under which a break from driving is detected by the system ▶ The vehicle is stopped and the ignition switched off.
▶ The vehicle is stopped, the seat belt removed and the driver's door opened.
▶ The vehicle is stopped for more than 15 minutes.
116Driving
If none of these conditions are met or if the driving style is not changed, the
system recommends a driving break again after 15 minutes.
The system can be activated/deactivated in the Infotainment » Owner's Man-
ual Infotainment .
Pause recommendation
The icon appears and the following message for a few seconds in the display
of the instrument cluster and a message about the detected fatigue. An au-
dible signal is also emitted.WARNING■ The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
For the driving ability is always the driver's responsibility. Never drive if
you feel tired.
■
The system may not detect all cases where a break is needed.
■
Therefore, take regular, sufficient breaks during long trips.
■
There will be no system warning during the so-called micro-sleep.
Note
■ In some situations, the system may evaluate the driving incorrectly and thus
mistakenly recommend a break (e.g. sporty driving, adverse weather condi-
tions or poor road conditions).■
The system is designed primarily for use on motorways.
Tyre pressure monitoring
Introduction
This chapter contains information on the following subjects:
Storing the tyre pressure values
117
Storing the tyre pressure values and Infotainment display
118
Storing the tire pressure values using the key
118
The tyre pressure monitoring function (hereinafter known as "system") moni-
tors the tyre pressure while driving.
If the tyre inflation pressure changes, the warning light
lights up in the in-
strument cluster and an audible signal sounds » page 32,
Tyre pressure .
The system can only function properly if the tyres have the prescribed tyre
pressure and this pressure values are stored in the system.
WARNING■ The general information relating to the use of assistance systems must
be observed » page 100, in section Introduction .■
The correct tyre pressure values is always the driver's responsibility. The
tyre pressure should be checked regularly » page 146.
■
The system cannot warn in case of very rapid loss of tyre pressure, e.g. in
the event of a sudden puncture.
Storing the tyre pressure values
Read and observe
on page 117 first.
The tyre pressure valuesare always stored in the system, if one of the fol-lowing events is present.▶ Change of tyre pressure values.
▶ Change one or more wheels.
▶ Change in position of a wheel on the vehicle.
▶ The warning light in the instrument cluster.
The storage of the tyre pressure values depends on equipment, either in the
infotainment or by pressing a button.
WARNINGBefore storing the tyre pressures they must be inflated to the specified in-
flation pressure » page 146. If incorrect pressure values are storedthe sys-
tem may not warn even with a tyre pressure that is too low.
CAUTION
The tyre pressure values should be stored every 10 000 km or once a year to
ensure proper system function.117Assist systems
Storing the tyre pressure values and Infotainment displayFig. 148
Button for storing the pressure
values / of the display: the sys-
tem indicates a front left tyre
change
Read and observe on page 117 first.
›
Inflate all of the tyres to the specified inflation pressure.
›
Turn on the ignition and switch on Infotainment.
›
Press the button in Infotainment and then tap on the function interfaces
Tap
→
Vehicle status
.
›
Use the function interfaces
Select the menu item
Tyre Pressure Loss In-
dicator .
›
Tap on the function
Tap on
» Fig. 148 .
In addition, follow the instructions that appear on the display.
A message in the display informs about the storage of the tyre pressure val-
ues.
Note
When a warning light in the instrument cluster appears, the affected tyre
can be displayed on the infotainment » Fig. 148.
Storing the tire pressure values using the key
Fig. 149
Button for storing the pressure
values
Read and observe on page 117 first.›
Inflate all of the tyres to the specified inflation pressure.
›
Switch on the ignition.
›
Press the symbol key
» Fig. 149 on the button.
The warning light
in the instrument cluster illuminates.
An acoustic signal sounds and the warning light extinguishes informs that the
storage of the tyre pressure values has taken place.
›
Press the symbol key
.
118Driving